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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

The only function of this machine is to upload files to its FTP and send e-mail to the intended recipient and sender that the files are ready for download. I am using a simple yousendit.com clone script that just does that, uploads the file, sends and e-mail and the recipient gets a link to download it. We set it up to only accept upload requests from inside our network.

My upload form ask user to browse for the file add message and e-mail of intended recipient. after they hit send the file gets uploaded and an e-mail sent to the person to download it. I was using send mail to handle the e-mails but, recently our domain was blacklisted because the e-mails we were sending with this machine did not have the correct headers.

I don't know if it is easier to set up sendmail to use one of our pop accounts? This machine has no other purpose but to serve as a file repository.

If I understand correctly, sendmail can be configured through the SMART_HOST feature to use an existing smtp server to route all outgoing mail. define(`SMART_HOST',`[your.mail.server]') is probably what you are looking for. The brackets keep sendmail from doing a MX lookup through DNS.